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CDBALT <br /> GEOTECHNICAL INVESTIGATION <br /> .`"111111.4. GE0SCIENCES <br /> EVERETT,WASHINGTON <br /> December 24, 2019 <br /> ASPHALTIC CONCRETE(FLEXIBLE)PAVEMENT <br /> LIGHT DUTY <br /> Asphaltic Concrete Aggregate Base* Compacted Subgrade*** <br /> 2.0 in. 6.o in. 12.0 in. <br /> HEAVY DUTY <br /> Asphaltic Concrete Aggregate Base* Compacted Subgrade*** <br /> 3.o in. 6.o in. 12.o in. <br /> PORTLAND CEMENT CONCRETE(RIGID)PAVEMENT <br /> Min.PCC Depth Aggregate Base* Compacted Subgrade*** <br /> 6.o in. 6.o in. 12.o in. <br /> *95%compaction based on ASTM Test Method D1557 <br /> **A proof roll may be performed in lieu of in place density tests <br /> The asphaltic concrete depth in the flexible pavement tables should be a surface course type asphalt, such <br /> as Washington Department of Transportation (WSDOT) 1/2 inch HMA. The rigid pavement design is <br /> based on a Portland Cement Concrete (PCC) mix that has a 28 day compressive strength of 4,00o pounds <br /> per square inch (psi). The design is also based on a concrete flexural strength or modulus of rupture of <br /> 55o psi. <br /> 9.o Construction Field Reviews <br /> Cobalt Geosciences should be retained to provide part time field review during construction in order to <br /> verify that the soil conditions encountered are consistent with our design assumptions and that the intent <br /> of our recommendations is being met.This will require field and engineering review to: <br /> • Monitor and test structural fill placement and soil compaction <br /> • Observe bearing capacity at foundation locations <br /> • Observe slab-on-grade preparation <br /> • Monitor subgrade preparation of roadways <br /> • Observe excavation stability <br /> 9 <br /> PO Box 82243 <br /> Kenmore,WA 98028 <br /> cobaltgeo la gmail.corm <br /> 206-331-1097 <br />